Prima Roller Weight Set 20x12mm | Yamaha Zuma, Vino 125

Dial in your scooter's CVT performance with Prima 20x12mm precision roller weights. The weight of your rollers determines when your variator shifts — swapping them lets you prioritize off-the-line snap or highway cruising efficiency. Black composite outer shell with aluminum inner bore insert, precision-manufactured for balanced rotation and smooth variator movement. Available in 9g through 15g; 6 weights per set.

Weight Selection Guide

• Light weights (9g–10g): Best for quick acceleration, stop-and-go city riding, and improved hill climbing. May reduce top-end speed slightly.
• Heavy weights (12g–15g): Ideal for long-distance commuting and maximizing top-end speed by keeping engine RPMs lower at high velocity.

Tuning tip: Riders over 200 lbs or with a stock motor generally see the best results with lighter weights. If you have installed a big bore kit (BBK), heavier weights are often required to keep the engine from over-revving past its new power band.

• Black composite outer shell — high-heat resistant, reduces flat-spotting
• Aluminum inner bore insert for smooth variator movement
• Precision-manufactured to strict tolerances for balanced rotation
• Extends variator service intervals
• Available in 9g through 15g for full CVT tuning range
• 6 weights per set — direct OEM replacement or performance upgrade

• Dimensions: 20mm diameter x 12mm width
• Quantity: 6 weights per set
• Available weights: 9g, 10g, 11g, 12g, 13g, 14g, 15g
• Fitment type: OEM replacement / performance upgrade
• SKU: ROLL20X12